:root {
    --green-light: #78BE20;
    --green-dark:  #006837;
    --text-dark:   #333;
    --bg-menu:     #fff;
    --border:      #e0e0e0;
  }
  
  .main-nav {
    position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  background-color: white;
  border-bottom: 2px solid var(--green-dark);
  }
  .menu, .menu * {
    font-family: Arial, sans-serif;
  }
  .menu {
    font-family: inherit;
  }
    
  .menu {
    list-style: none;
    display: flex;
    align-items: center;
    padding: 0 20px;
    margin: 0;
  }
  
  .menu > li {
    position: relative;
    margin-right: 40px;  /* más espacio entre opciones */
  }
  
  .menu > li:last-child {
    margin-right: 0;
  }
  
  .menu li.logo img {
    height: 40px;
  }
  
  .menu > li > a {
    display: block;
    padding: 16px 12px;
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
  }
  
  .menu > li > a:hover {
    color: var(--green-light);
  }
  
  /* Submenú inicialmente oculto */
  .submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--bg-menu);
    border: 1px solid var(--border);
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    border-radius: 4px;
    padding: 4px 0;
    min-width: 180px;
    z-index: 10;
    list-style: none;
  }
  
  /* Mostrar submenú al hover */
  .menu li:hover > .submenu {
    display: block;
  }
  
  .submenu li {
    margin: 0;
  }
  
  .submenu li a {
    display: block;
    padding: 10px 14px;
    color: var(--text-dark);
    text-decoration: none;
    transition: background 0.2s, color 0.2s;
  }
  
  .submenu li a:hover {
    background: var(--green-light);
    color: #fff;
  }